I released Sybil Green on February 16, 2000. The idea came from the opening credits of the 1968 Peter Sellers film The Party. I rented it on VHS and saw hand-lettered credits with filled counters in a cartoony psychedelic style. I had to return the tape before I could study it closely, so I recreated the lettering from memory the next day. When I later saw the DVD version, I realized my version was close but not identical. That difference gave it its own character. I named the typeface after a song by the Blues Magoos, a nod to the same late-1960s psychedelic culture.

Sybil Green was always a single-style typeface. It had no alternates or special OpenType features, just a straightforward character set. I released it with a free commercial-use desktop license, and like many fonts of that period, it quickly spread to every major free font site. It became one of my most popular free fonts, though it never had specific high-profile uses I can point to. In April 2024, I placed Sybil Green in the public domain.